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Abstract

On-line tests (OLT's) test operating capabilities by initiating sequences of commands in I/O subsystems. Operations are chained with a SET DIAGNOSE channel command. A described sequence of steps takes into account the operational characteristics of an I/O controller (CU) in a magnetic tape subsystem, to diagnose CU's ability to detect and report hardware errors in real time.

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United States

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English (United States)

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Diagnosing Hardware Error Detecting Circuits

On-line tests (OLT's) test operating capabilities by initiating sequences of
commands in I/O subsystems. Operations are chained with a SET DIAGNOSE
channel command. A described sequence of steps takes into account the
operational characteristics of an I/O controller (CU) in a magnetic tape
subsystem, to diagnose CU's ability to detect and report hardware errors in real
time.

CU is designed to respond to a SET DIAGNOSE channel command having a
CCW (channel control word) with the loop-write-to-read (LWR) bit active, to
subsequently receive only write operations. In other words, a write operation
must always follow a SET DIAGNOSE having an LWR CCW.

To test the hardware error-detection circuits, a control command involving
readback operations is chained to a SET DIAGNOSE having an LWR CCW. For
example, such a control command can be forward space record (FSR), backward
space record (BSR), or FILE OP. Such a sequence of commands causes the
supervising microprogram in CU to be in a write mode with the hardware or data
flow circuits which process signals being in the read mode. As a result, the data
flow circuits generate no write clock. The microprogram, which is in the write
mode, expects a write clock and responds by indicating a hardware error, i.e.,
absence of a write clock during write mode.